diff -up rcs-5.7/man/Makefile.in~ rcs-5.7/man/Makefile.in
--- rcs-5.7/man/Makefile.in~	2009-06-23 00:06:19.000000000 +0300
+++ rcs-5.7/man/Makefile.in	2009-06-23 00:08:06.000000000 +0300
@@ -49,17 +49,17 @@ rcsfile.5 : rcsfile.5in
 check dvi info TAGS ::
 
 installdirs :: ../mkinstalldirs
-	-$(srcdir)/../mkinstalldirs $(man1dir) $(man5dir)
+	-$(srcdir)/../mkinstalldirs $(DESTDIR)$(man1dir) $(DESTDIR)$(man5dir)
 
 man1pages = ci co ident merge rcs rcsclean rcsdiff rcsintro rcsmerge rlog \
 		rcsfreeze
 
 install :: installdirs
 	-for m in $(man1pages); do \
-		$(INSTALL_DATA) $(srcdir)/$$m.1 $(man1dir)/$$m$(man1ext); \
+		$(INSTALL_DATA) $(srcdir)/$$m.1 $(DESTDIR)$(man1dir)/$$m$(man1ext); \
 	done
 	-{ test -f rcsfile.5 || cd $(srcdir); } && \
-	$(INSTALL_DATA) rcsfile.5 $(man5dir)/rcsfile$(man5ext)
+	$(INSTALL_DATA) rcsfile.5 $(DESTDIR)$(man5dir)/rcsfile$(man5ext)
 
 uninstall ::
 	for m in $(man1pages); do \
diff -up rcs-5.7/src/Makefile.in~ rcs-5.7/src/Makefile.in
--- rcs-5.7/src/Makefile.in~	2009-06-23 00:06:19.000000000 +0300
+++ rcs-5.7/src/Makefile.in	2009-06-23 00:07:29.000000000 +0300
@@ -110,13 +110,13 @@ all :: $(PROGRAMS)
 	$(CC) -c $(ALL_CFLAGS) $<
 
 installdirs :: ../mkinstalldirs
-	$(srcdir)/../mkinstalldirs $(bindir)
+	$(srcdir)/../mkinstalldirs $(DESTDIR)$(bindir)
 
 install :: all installdirs
 	for p in $(PROGRAMS); do \
-	  $(INSTALL_PROGRAM) $$p $(bindir)/$$p; \
+	  $(INSTALL_PROGRAM) $$p $(DESTDIR)$(bindir)/$$p; \
 	done
-	$(INSTALL_PROGRAM) rcsfreeze.sh $(bindir)/rcsfreeze
+	$(INSTALL_PROGRAM) rcsfreeze.sh $(DESTDIR)$(bindir)/rcsfreeze
 
 uninstall ::
 	for p in $(PROGRAMS); do \